ksym2name
errx(EXIT_FAILURE, "keysym %s not found", ksym2name(ksym));
(void)printf(" %s", ksym2name(mp->command));
(void)printf(" %s", ksym2name(mp->group1[0]));
(void)printf(" %s", ksym2name(mp->group1[1]));
(void)printf(" %s", ksym2name(mp->group2[0]));
(void)printf(" %s", ksym2name(mp->group2[1]));
const char *ksym2name(int);